CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 38,997	$ 11,955
Accounts receivable, net of allowance for doubtful accounts	40,314	47,965
Derivative assets	0	97,956
Other current assets	4,939	7,104
Total current assets	84,250	164,980
Property and equipment, net (successful efforts method)	321,132	344,395
Other assets	6,740	8,350
Total assets	412,122	517,725
Current liabilities
Accounts payable and accrued liabilities	53,160	103,525
Derivative Liability, Current	4,527
Long-term Debt, Current Maturities	112,553	1,224,383
Total current liabilities	170,240	1,327,908
Liabilities Subject to Compromise	1,158,355	0
Derivative Liability, Noncurrent	13,715	0
Other liabilities	84,346	104,938
Commitments and contingencies (Note 13)
Shareholders’ deficit:
Preferred stock of $100 par value – 100,000 shares authorized; Series A – 3,864 and 3,915 shares issued as of June 30, 2016 and December 31, 2015, respectively, and Series B – 14,933 and 27,551 issued as of June 30, 2016 and December 31, 2015, each with a redemption value of $10,000 per share	1,880	3,146
Common stock of $0.01 par value – 228,000,000 shares authorized; 88,217,880 and 81,252,676 shares issued as of June 30, 2016 and December 31, 2015, respectively	697	628
Paid-in capital	1,208,363	1,211,088
Accumulated deficit	(2,225,724)	(2,130,271)
Deferred compensation obligation	3,440	3,440
Accumulated other comprehensive income	384	422
Treasury stock – 455,689 and 455,689 shares of common stock, at cost, as of June 30, 2016 and December 31, 2015, respectively	(3,574)	(3,574)
Total shareholders’ deficit	(1,014,534)	(915,121)
Total liabilities and shareholders’ deficit	$ 412,122	$ 517,725